I guess I should define my terms. To me, mythic science fiction is a legend or creation myth retold with science fiction conceits. I'm not sure if that's the generally agreed upon definition, but I'd say that my Coyote Discovers Mars story fits it, as does the story I just wrote for the Chinese themed anthology. What's interesting about writing in this subgenre is that it is hard to balance the myth and the science.
First of all, the stories are pretty light on science, going instead for cinematic images and fantastical moments rather than being grounded in our physical universe. And yet, I find that when I workshop these stories, a certain percentage of people will grab hold of one scientific inaccuracy and want it corrected.
In my short story for the anthology, the line was pretty clear once the editors pointed it out. There is a storyline that takes place in the modern day told alongside a legent. The legend can be fantastical. The modern day parts need to pass scientific muster.
But in other circumstances, it's hard to say what it is that strikes a reader as so much fun they don't care if its accurate versus something that knocks them out of their suspension of disbelief. My hunch is that the parts that capture their imagination are easily forgiven, while the parts that don't get scrutinized.
Anyway, just my random thoughts. Please do add your own, as I love writing these types of stories and would love to sell more of them.